/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMeshOctree3.h
Find the nearest triangle of the mesh that is hit by the ray
int32 FindNearestHitObject ( const FRay3d & Ray, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< bool(int)> IncludeTriangleIDFunc, double MaxDistance ) const